Trolley-wheel bushing.



UNITED STATES PATENT EEICE.

FRED MERCHANT CARROLL, OF NEW HAVEN, CONNECTICUT, ASSIGNOR To THE H. B. mm 00., OF NEW HAVEN, CONNECTICUT, A CORPORA- TION.

TROLLEY-WHEEL BUSHING.

Specification of Letters Patent.

Patented Aug. 1, 1905.

Application filed March 20, 1905. Serial No. 250,927.

T0 00% whom it may concern:

Be it known that I, FRED MERCHANT OAR- ROLL, a citizen of the United States, residing at New Haven, in the county of New. Haven and State of Connecticut, have invented anew and useful Improvement in Trolley-Wheel Bushings; and I do hereby declare the following, when taken in connection with the accompanymg drawings and the numerals of refer- My invention relates to an improvement in trolley-wheel bushings, the object being to produce aself-lubricating bushing of superior I efiiclency and durability. I

With these endsin view my invention consists in a trolleywheel bushing having certain details of construction, as will be hereinafter described, and pointed outin the claim. In carrying out my invention as herein shown I provide an otherwise ordinary bushing 2 with an internal annular packing-recess 3, located midway between its ends, for the reception of an absorbent packing of any material suitable for absorbing and carrying oil supplied to itthrough a small radial feed-hole 5 at its outer end opening into an annular oilchamber 6, formed in the hub 7 of the trolleywheel 8. A feed-hole 9, leading into the said chamber 6, is provided for filling the same and normally closed by a screw-plug 10. I also form the bushing 2 wi-th'two groups of graphite-receiving pockets 11, the inner ends of which are located close to, but isolated from, the edges of the annular recess 3. As shown, these pockets are symmetrically arrangedon opposite sides of the said recess 3, each group of pockets comprising four pockets arranged equidistant from each other, oblong in form, and extending lengthwise with the axis of the bushing 2; but whatever the particular shape of the pockets and however arranged there will always be between their outer ends and the ends of the bushing unbroken annular bearing-surfaces 12. These surfaces 12 form a portion of the internal periphery of the bushing, but are especially designated for the reason that the provision for lubricationis designed with particular reference to leaving these portions of the internal surface of the bushing unbroken, so that at the ends ofthebushi'ng, where the tendency to wear is the greatest, the integrity of the bearing-surfaces will be untouched. In explanation of this it may be said that the strain and wear of a trolley-wheel bushing is more severe at its ends than elsewhere and that consequently it is desirable that the bushing should not be internally cut away at its ends for the purpose of introducing lubricating material.

The extreme ends of the bushing are formed with annular grooves 13 for the reception of graphite. The operation of my improved bushing 1s as follows: Oil having been supplied to the pack-.

ing 4 in the recess 3 and graphite having been introduced into the pockets 11, a film of the oil works outward over the outer edges of the .recess 3 into the inner ends of the pockets,

whereby a modicum of oil is continuously supplied to the graphite, the lubricating qualities of which are thereby increased.

Instead of forming the trolley-wheel with an oil-chamber 6 it will be suflicient to form the hub of the wheel with an oil-passage 14, as shown by Fig. 3. Then by bringing the feed-hole 5 of the bushing into registration with the inner end of the passage 14; the packing 4 may be charged with oil suflicient to last for a long time. i

In View of the modification suggested and of others which may obviously bemade I would have'it understood than I do not limit myself thereto, but hold myself at liberty to make such departures therefrom as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is'

A trolley-wheel bushing having an internal annular recess located midway of its length for the reception of an absorbent packing,

and graphite-receiving pockets located on opspecification in the presence of two subscribposite sides of the said recess and separated ing Witnesses. therefrom, the outer ends of the said pockets being separated from the ends of the bushing FRED MERCHANT CARROLL by unbroken annular bearingsurfaces to Witnesses: Withstand the Wear of the axle in the bushing. FRED. C. EARLE,

In testimony whereof I have signed this GEORGE D. SEYMOUR. 

